Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 14, Pages 13416-13422Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b01480
Keywords
flexible electronics; mechanical reliability; multiple neutral planes; stress concentration; digital image correlation
Funding
- Wearable Platform Materials Technology Center - National Research Foundation (NRF) under the Ministry of Science, ICT and Future Planning (MSIP) [2016R1A5A1009926]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) under the Ministry of Trade, Industry Energy (MOTIE) [20183010014470]
- Graphene Materials and, Components Development Program under MOTIE/KEIT of the Republic of Korea [10044412]
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For flexible devices that inevitably undergo repetitive deformations, it is important to evaluate and control the mechanical strain imposed on the flexible systems for enhancing the reliability. In this paper, a novel experimental method to directly visualize cross-sectional strain distribution in the thin flexible devices is proposed. Digital image correlation (DIC) is effectively adapted by using microscopic images of the cross section for accurate analysis of the microscale deformations. To conduct the DIC strain analysis, speckle patterning is accomplished by using microparticles from diamond-abrasive suspensions with optimized fabrication conditions. First, the cross-sectional micro-DIC analysis is performed successfully for 100 mu m-thick substrates. Full-field strain quantification and easy inspection of a neutral plane are demonstrated and compared with results of finite element analysis simulation. Using the presented method, generation of multiple neutral planes is clearly visualized for a trilayer structure with a very soft adhesive midlayer, where strain decoupling occurs by severe shear deformation of the soft adhesive layer. Furthermore, bending strain distribution in a flexible fabric-reinforced polymer (FRP) substrate is also investigated to analyze and predict fatigue fracture in the complex inner structure under repetitive bending loading.
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